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Interfacial reactions between Sn-Cu solders and Ni-Co alloys at 250 °C

Published online by Cambridge University Press:  31 January 2011

Chih-Chi Chen ,
Ya-Ting Chan  and
Yue-Ting Chen
Yue-Ting Chen
Affiliation:
R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University, Chung Li, Taiwan 32023
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Abstract

Sn-xCu/Ni-yCo (x = 0.2–1.0 wt%, y = 10, 20, 40 at.%) interfacial reactions at 250 °C are examined in this study. Sn-Cu alloys are promising lead free solders, and Ni-Co alloys are the potential diffusion barrier layer materials in flip chip packaging. The Co and Cu effects on the Sn-Cu/Ni-Co interfacial reactions are examined. When the Co addition is 10 at.%, the reaction phases are the Ni3Sn4 and Cu6Sn5 phase, and Sn-Cu/Ni-10at.%Co interfacial reactions are similar to those of Sn-Cu/Ni. When the Co addition is 20 at.%, the CoSn2 phase is formed, and the reaction path is Sn-Cu/Ni3Sn4/CoSn2/Ni-20at.%Co. When the Co addition is 40 at.%, only Sn-Co binary phases are formed (CoSn2 and CoSn3), and Sn-Ni binary phases are not formed. The Cu6Sn5 phase is not formed until the Cu content is higher than 0.7 wt%. The Cu concentration effect is the main drawback of using Ni as the diffusion barrier layer material and the Sn-Cu solders. The Cu concentration effect of the Sn-Cu/Ni-Co interfacial reactions is not as pronounced as that of Sn-Cu/Ni.

Keywords

SolderingPackagingDiffusion
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1321 - 1328
Copyright
Copyright © Materials Research Society 2010

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